The Question is from neet-botany plant-physiology , and it was created by the author Mr. NARESH KUMAR K

Question

Which of the following statements regarding facilitated diffusion is INCORRECT?

Mr. NARESH KUMAR K · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**: Facilitated Diffusion
	**Related Topics**: Passive Transport, Active Transport, Cell Membrane, Transport Proteins
	**Prerequisites**: Understanding of concentration gradients and membrane transport.
## SOLUTION PATHWAY
**Given Information**:
	The question asks for the INCORRECT statement about facilitated diffusion.
**Method & Steps**:
	1. **Recall the definition of facilitated diffusion**: It's the passive movement of molecules across a cell membrane via transport proteins.
		Reasoning: This helps us eliminate options related to the basic definition.
	2. **Analyze each option based on the definition and characteristics of facilitated diffusion**:
		Working: 
			- A. It requires transport proteins - This is TRUE. Facilitated diffusion uses protein channels or carriers.
			- B. It is a passive process and does not require energy - This is TRUE. It relies on the concentration gradient.
			- C. It can move molecules against their concentration gradient - This is FALSE. Facilitated diffusion moves molecules DOWN their concentration gradient.
			- D. Transport proteins involved can become saturated - This is TRUE. There's a limited number of transport proteins, so they can reach maximum capacity.
		Key Point: The key difference between facilitated diffusion and active transport lies in the direction of movement relative to the concentration gradient and energy requirement.
	3. **Identify the incorrect statement**: Option C contradicts the fundamental principle of facilitated diffusion.
		Result: Option C is the incorrect statement.
		Verification: Facilitated diffusion, being a passive process, cannot move molecules against their concentration gradient.  Active transport mechanisms are required for such movement.
 ## OPTION ANALYSIS
[A] ✓: Facilitated diffusion, by definition, requires transport proteins (carrier proteins or channel proteins) embedded within the cell membrane to facilitate the movement of specific molecules across the membrane.
[B] ✓:  Facilitated diffusion is a passive process, meaning it doesn't require the cell to expend energy.  The movement of molecules occurs down their concentration gradient, from an area of higher concentration to an area of lower concentration.
[C] :x: This statement is incorrect. Facilitated diffusion moves molecules down their concentration gradient, not against it. Movement against the concentration gradient requires energy and is characteristic of active transport.
[D] ✓:  The transport proteins involved in facilitated diffusion can become saturated. This occurs when all available transport proteins are occupied by molecules, and the rate of transport reaches a maximum, even if the concentration gradient increases further.
 ## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing facilitated diffusion with active transport: Remember that facilitated diffusion is passive (no energy required) and moves molecules down their concentration gradient, while active transport requires energy and moves molecules against their concentration gradient.
		2. Thinking all membrane transport requires energy: Simple diffusion and facilitated diffusion are both passive processes.
	**Quick Tips**:
		1. 'Facilitated' means 'helped' – the transport proteins 'help' the molecules move across the membrane.
		2. Remember 'downhill' for facilitated diffusion (down the concentration gradient) and 'uphill' for active transport (against the concentration gradient).

Mr. NARESH KUMAR K · Answer

It requires transport proteins.

Mr. NARESH KUMAR K · Answer

It is a passive process and does not require energy.

Mr. NARESH KUMAR K · Answer

The correct Option is "It can move molecules against their concentration gradient."

Mr. NARESH KUMAR K · Answer

Transport proteins involved can become saturated.

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